Thank you for your question. Masturbation is a normal thing and should be done once in a while. But regular and excessive masturbation can be harmful in certain ways. Research shows that it decreases sperm count.Moreover back to back masturbation decreases the amount of seminal fluid( slimy watery fluid that wets the penis before the actual ejaculation). Thus the penis becomes prone to injury without the fluid and it can become sore. Coming to your Other problem of Excessive arousal, it is something you can control on your own. U have to indulge yourself in a profession that is both fun and challenging. When your mind will get absorbed into something you really love then all the other thoughts that disturb you would fade away. Whatever your passion is you chase it. Try working hard for your dreams. Try getting into some kind of sport. Physical exercise helps keep the mind clean. Furthermore You just have to remember that the women you see around maybe good looking but they should be respected. Try to divert your mind when such thoughts creep in. Moreover Rape is a punishable offence and a heinous crime. Whenever you hear a Rape news, instead of getting excited try to imagine the suffering, the pain, the humiliation that lady went through. Imagine what would have happened if that lady was your friend or someone you are related to. Build up hatred against the Rapist. Try to protect a lady from eve-teasing or if people are trying to take advantage of her in crowded trains ,buses, metros. Whenever you help out a woman in distress you will feel good inside and these thoughts will slowly go away.